Solid fuel heater



FIG. 1 is a front perspective view of a solid fuel heater, showing my new design;

FIG. 2 is a left side perspective view thereof;

FIG. 3 is a right side perspective view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof.

The rear surface of the solid fuel heater is substantially planar and unornamented. 

The ornamental design for a solid fuel heater, as shown and described. 